13809309 has 8 divisors (see below), whose sum is σ = 18760032. Its totient is φ = 9032400.

The previous prime is 13809293. The next prime is 13809311. The reversal of 13809309 is 90390831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13809309 - 2⁴ = 13809293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13809309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43267 + ... + 43584.

It is an arithmetic number, because the mean of its divisors is an integer number (2345004).

Almost surely, 2^13809309 is an apocalyptic number.

It is an amenable number.

13809309 is a deficient number, since it is larger than the sum of its proper divisors (4950723).

13809309 is an equidigital number, since it uses as much as digits as its factorization.

13809309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86907.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 13809309 is about 3716.0878622551. The cubic root of 13809309 is about 239.9149525046.

The spelling of 13809309 in words is "thirteen million, eight hundred nine thousand, three hundred nine".